Coating Material for Cathode Active Material in Lithium Batteries

ABSTRACT

A lithium battery comprises cathode active material comprising particles of a transition metal oxide, each particle coated in an ion-conducting material that has an electrochemical stability window against lithium of at least 2.2 V, a lowest electrochemical stability being less than 2.0 V and a highest electrochemical stability being greater than 4.2 V, the ion-conducting material selected from the group consisting of: Cs2LiC13; Cs2LiCrF6; Cs2LiDyCl6; Cs2LiErCl6; Cs2LiGdCl6; Cs2LiLuCl6; Cs2LiNdCl6; Cs2LiPrCl6; Cs2LiScCl6; Cs2LiSmCl6; Cs2LiTbCl6; Cs2LiTmCl6; Cs2LiYCl6; Cs3Li2Cl5; Cs3LiCl4; CsLi2Cl3; CsLi3Cl4; CsLiBeF4; CsLiCl2; K10LiZr6H4O2F35; K2LiCeCl6; K2LiDyCl6; K2LiGdCl6; K2LiLaCl6; K2LiPrCl6; K2LiTbCl6; KLiDyF5; KLiErF5; KLiGdF5; KLiHoF5; KLiLuF5; KLiPH2O4F; KLiTbF5; KLiTmF5; KLiYF5; Li10Mg7Cl24; Li2B3O4F3; Li2B6O9F2; Li2BeCl4; Li2BF5; Li2CaHfF8; Li2MgCl4; Li2SiF6; Li2Ta2(OF2)3; Li2ZnCl4; Li2ZrF6; Li3AlF6; Li3ErCl6; Li3ScCl6; Li3ScF6; Li3ThF7; Li3YF6; Li4Be3P3BrO12; Li4Be3P3ClO12; Li4ZrF8; Li6ZrBeF12; Li9Mg3P4O16F3; LiAlCl4; LiB6O9F; LiBF4; LiGdCl4; LiLuF4; LiScF4; LiTaF6; LiThF5; LiYF4; LiZr5T1F22; Na3Li3Al2F12; NaLi2AlF6; NaLiBeF4; NaLiMgPO4F; Rb2LiCeCl6; Rb2LiDyCl6; Rb2LiErCl6; Rb2LiGdCl6; Rb2LiLaCl6; Rb2LiLuCl6; Rb2LiPrCl6; Rb2LiScCl6; Rb2LiTbCl6; Rb2LiYCl6; RbLi2Be2F7; RbLiCl2; and RbLiF2.

TECHNICAL FIELD

This disclosure relates to lithium batteries having cathode active material coated in one or more materials possessing high ionic conductivity and stability against lithium.

BACKGROUND

Advances have been made toward high energy density batteries, using lithium metal as the anode material, including both lithium ion batteries and all-solid-state batteries (ASSBs). Discovery of new materials and the relationship between their structure, composition, properties, and performance have advanced the field. However, even with these advances, batteries remain limited by the underlying choice of materials and electrochemistry. Among the components in both lithium ion and ASSBs, the cathode active material may limit the energy density and dominate the battery cost.

SUMMARY

Disclosed herein are implementations of a cathode material for a lithium battery and lithium-ion batteries and ASSBs including the cathode material.

One embodiment of a lithium battery comprises an anode comprising lithium, an electrolyte, and a cathode comprising cathode active material. The cathode active material comprises particles of a transition metal oxide, each particle coated in an ion-conducting material that has an electrochemical stability window against lithium of at least 2.2 V, a lowest electrochemical stability being less than 2.0 V and a highest electrochemical stability being greater than 4.2 V, the ion-conducting material selected from the group consisting of: Cs₂LiCl₃; Cs₂LiCrF₆; Cs₂LiDyCl₆; Cs₂LiErCl₆; Cs₂LiGdCl₆; Cs₂LiLuCl₆; Cs₂LiNdCl₆; Cs₂LiPrCl₆; Cs₂LiScCl₆; Cs₂LiSmCl₆; Cs₂LiTbCl₆; Cs₂LiTmCl₆; Cs₂LiYCl₆; Cs₃Li₂Cl₅; Cs₃LiCl₄; CsLi₂Cl₃; CsLi₃Cl₄; CsLiBeF₄; CsLiCl₂; K₁₀LiZr₆H₄O₂F₃₅; K₂LiCeCl₆; K₂LiDyCl₆; K₂LiGdCl₆; K₂LiLaCl₆; K₂LiPrCl₆; K₂LiTbCl₆; KLiDyF₅; KLiErF₅; KLiGdF₅; KLiHoF₅; KLiLuF₅; KLiPH₂O₄F; KLiTbF₅; KLiTmF₅; KLiYF₅; Li₁₀Mg₇Cl₂₄; Li₂B₃O₄F₃; Li₂B₆O₉F₂; Li₂BeCl₄; Li₂BF₅; Li₂CaHfF₈; Li₂MgCl₄; Li₂SiF₆; Li₂Ta₂(OF₂)₃; Li₂ZnCl₄; Li₂ZrF₆;Li₃AlF₆; Li₃ErCl₆; Li₃ScCl₆; Li₃ScF₆; Li₃ThF₇; Li₃YF₆; Li₄Be₃P₃BrO₁₂; Li₄Be₃P₃ClO₁₂; Li₄ZrF₈; Li₆ZrBeF₁₂; Li₉Mg₃P₄O₁₆F₃; LiAlCl₄; LiB₆O₉F; LiBF₄; LiGdCl₄; LiLuF₄; LiScF₄; LiTaF₆; LiThF₅; LiYF₄; LiZr₅T_(l)F₂₂; Na₃Li₃Al₂F₁₂; NaLi₂AlF₆; NaLiBeF₄; NaLiMgPO₄F; Rb₂LiCeCl₆; Rb₂LiDyCl₆; Rb₂LiErCl₆; Rb₂LiGdCl₆; Rb₂LiLaCl₆; Rb₂LiLuCl₆; Rb₂LiPrCl₆; Rb₂LiScCl₆; Rb₂LiTbCl₁₆; Rb₂LiYCl₆; RbLi₂Be₂F₇; RbLiCl₂; and RbLiF₂.

Another embodiment of a lithium battery as disclosed herein is an all-solid-state battery comprising a lithium-metal based anode, a solid electrolyte, and a cathode comprising a transition metal oxide active material coated in an ion-conducting material that has an electrochemical stability window against lithium of at least 2.2 V, a lowest electrochemical stability being less than 2.0 V and a highest electrochemical stability being greater than 4.2 V, the ion-conducting material selected from the group consisting of: Cs₂LiCl₃; Cs₂LiCrF₆; Cs₂LiDyCl₆; Cs₂LiErCl₆; Cs₂LiGdCl₆; Cs₂LiLuCl₆; Cs₂LiNdCl₆; Cs₂LiPrCl₆; Cs₂LiScCl₆; Cs₂LiSmCl₆; Cs₂LiTbCl₆; Cs₂LiTmCl₆; Cs₂LiYCl₆; Cs₃Li₂Cl₅; Cs₃LiCl₄; CsLi₂Cl₃; CsLi₃Cl₄; CsLiBeF₄; CsLiCl₂; K₁₀LiZr₆H₄O₂F₃₅; K₂LiCeCl₆; K₂LiDyCl₆; K₂LiGdCl₆; K₂LiLaCl₆; K₂LiPrCl₆; K₂LiTbCl₆; KLiDyF₅; KLiErF₅; KLiGdF₅; KLiHoF₅; KLiLuF₅; KLiPH₂O₄F; KLiTbF₅; KLiTmF₅; KLiYF₅; Li₁₀Mg₇Cl₂₄; Li₂B₃O₄F₃; Li₂B₆O₉F₂; Li₂BeCl₄; Li₂BF₅; Li₂CaHfF₈; Li₂MgCl₄; Li₂SiF₆; Li₂Ta₂(OF₂)₃; Li₂ZnCl₄; Li₂ZrF₆; Li₃AlF₆; Li₃ErCl₆; Li₃ScCl₆; Li₃ScF₆; Li₃ThF₇; Li₃YF₆; Li₄Be₃P₃BrO₁₂; Li₄Be₃P₃ClO₁₂; Li₄ZrF₈; Li₆ZrBeF₁₂; Li₉Mg₃P₄O₁₆F₃; LiAlCl₄; LiB₆O₉F; LiBF₄; LiGdCl₄; LiLuF₄; LiScF₄; LiTaF₆; LiThF₅; LiYF₄; LiZr₅T_(l)F₂₂; Na₃Li₃Al₂F₁₂; NaLi₂AlF₆; NaLiBeF₄; NaLiMgPO₄F; Rb₂LiCeCl₆; Rb₂LiDyCl₆; Rb₂LiErCl₆; Rb₂LiGdCl₆; Rb₂LiLaCl₆; Rb₂LiLuCl₆; Rb₂LiPrCl₆; Rb₂LiScCl₆; Rb₂LiTbCl₆; Rb₂LiYCl₆; RbLi₂Be₂F₇; RbLiCl₂; and RbLiF₂.

An embodiment of a cathode for a lithium battery comprises active cathode material particles and a coating on the active cathode material particles. The coating comprises an ion-conducting material, the ion-conducting material having an electrochemical stability window against lithium of at least 2.2 V, a lowest electrochemical stability being less than 2.0 V and a highest electrochemical stability being greater than 4.2 V, the ion-conducting material comprising one or more of: Cs₂LiCl₃; Cs₂LiCrF₆; Cs₂LiDyCl₆; Cs₂LiErCl₆; Cs₂LiGdCl₆; Cs₂LiLuCl₆; Cs₂LiNdCl₆; Cs₂LiPrCl₆; Cs₂LiScCl₆; Cs₂LiSmCl₆; Cs₂LiTbCl₆; Cs₂LiTmCl₆; Cs₂LiYCl₆; Cs₃Li₂Cl₅; Cs₃LiCl₄; CsLi₂Cl₃; CsLi₃Cl₄; CsLiBeF₄; CsLiCl₂; K₁₀LiZr₆H₄O₂F₃₅; K₂LiCeCl₆; K₂LiDyCl₆; K₂LiGdCl₆; K₂LiLaCl₆; K₂LiPrCl₆; K₂LiTbCl₆; KLiDyF₅; KLiErF₅; KLiGdF₅; KLiHoF₅; KLiLuF₅; KLiPH₂O₄F; KLiTbF₅; KLiTmF₅; KLiYF₅; Li₁₀Mg₇Cl₂₄; Li₂B₃O₄F₃; Li₂B₆O₉F₂; Li₂BeCl₄; Li₂BF₅; Li₂CaHfF₈; Li₂MgCl₄; Li₂SiF₆; Li₂Ta₂(OF₂)₃; Li₂ZnCl₄; Li₂ZrF₆; Li₃AlF₆; Li₃ErCl₆; Li₃ScCl₆; Li₃ScF₆; Li₃ThF₇; Li₃YF₆; Li₄Be₃P₃BrO₁₂; Li₄Be₃P₃ClO₁₂; Li₄ZrF₈; Li₆ZrBeF₁₂; Li₉Mg₃P₄O₁₆F₃; LiAlCl₄; LiB₆O₉F; LiBF₄; LiGdCl₄; LiLuF₄; LiScF₄; LiTaF₆; LiThF₅; LiYF₄; LiZr₅T_(l)F₂₂; Na₃Li₃Al₂F₁₂; NaLi₂AlF₆; NaLiBeF₄; NaLiMgPO₄F; Rb₂LiCeCl₆; Rb₂LiDyCl₆; Rb₂LiErCl₆; Rb₂LiGdCl₆; Rb₂LiLaCl₆; Rb₂LiLuCl₆; Rb₂LiPrCl₆; Rb₂LiScCl₆; Rb₂LiTbCl₆; Rb₂LiYCl₆; RbLi₂Be₂F₇; RbLiCl₂; and RbLiF₂.

In any of the embodiments herein, the electrochemical stability window against lithium of the ion-conducting material can be at least 2.8 V and the highest electrochemical stability is greater than 4.8 V, the ion-conducting material selected from the group consisting of: Cs₂LiCrF₆; Cs₂LiLuCl₆; CsLiBeF₄; KLiDyF₅; KLiErF₅; KLiGdF₅; KLiHoF₅; KLiLuF₅; KLiTbF₅; KLiTmF₅; KLiYF₅; Li₂BF₅; Li₂CaHfF₈; Li₂SiF₆; Li₂ZrF₆; Li₂Ta₂(OF₂)₃; Li₃AlF₆; Li₃ScF₆; Li₃YF₆; Li₃ThF₇; Li₄ZrF₈; Li₆ZrBeF₁₂; LiB₆O₉F; LiBF₄; LiLuF₄; LiScF₄; LiYF₄; LiThF₅; LiTaF₆; LiZr₅TlF₂₂; Na₃Li₃Al₂F₁₂; NaLi₂AlF₆; NaLiBeF₄; RbLi₂Be2F₇; and RbLiF₂.

BRIEF DESCRIPTION OF THE DRAWINGS

The disclosure is best understood from the following detailed description when read in conjunction with the accompanying drawings. It is emphasized that, according to common practice, the various features of the drawings are not to-scale. On the contrary, the dimensions of the various features are arbitrarily expanded or reduced for clarity.

FIG. 1 is a cross-section schematic view of a lithium battery cell as disclosed herein.

FIG. 2 is a cross-section schematic view of a coated cathode active material particle.

DETAILED DESCRIPTION

A battery's voltage and capacity, and thus the battery's output, can be optimized by, at least in part, increasing the potential difference between the anode and cathode, reducing the mass and volume of active material necessary, and reducing consumption of the electrolyte by reducing oxidation or reduction reactions.

For lithium batteries, electrode materials are those that reversibly insert ions through ion-conductive, crystalline materials. Conventional cathode active material consists of a transition metal oxide, which undergoes low-volume expansion and contraction during lithiation and delithiation. The anode active material can be lithium metal, the low density of lithium metal producing a much higher specific capacity than traditional graphite anode active material.

To improve battery performance, one area of focus is on identifying higher-capacity cathode materials with increased lithium ion conductivity, reversibly exchanging lithium ions quickly at higher potentials.

Disclosed herein are cathodes comprising cathode active material coated with an ion-conducting material selected based on the following material characteristics: ionic migration; a wide electrochemical stability window against lithium; stability against lithium metal; and inertness to environmental elements like water and air. Rather than focusing on alternative cathode active materials themselves, the cathode coating materials herein focus on improving the performance of cathode active materials in lithium batteries using lithium metal anodes, and in particular transition metal oxide-based cathode active materials.

A lithium battery cell 100 is illustrated schematically in cross-section in FIG. 1. The lithium battery cell 100 of FIG. 1 is configured as a layered battery cell that includes as active layers a cathode active material layer 102 as described herein, an electrolyte 104, and an anode active material layer 106. In some embodiments, such as lithium batteries using a liquid or gel electrolyte, the lithium battery cell 100 may include a separator interposed between the cathode composite layer 102 and the anode active material layer 106. In addition to the active layers, the lithium battery cell 100 of FIG. 1 may include a cathode current collector 108 and an anode current collector 110, configured such that the active layers are interposed between the anode current collector 110 and the cathode current collector 108. In such a configuration, the cathode current collector 108 is adjacent to the cathode composite layer 102, and the anode current collector 110 is adjacent to the anode active material layer 106. A lithium battery can be comprised of multiple lithium battery cells 100.

The anode active material in the anode active material layer 106 can be a layer of elemental lithium metal, a layer of a lithium compound(s) or a layer of doped lithium. The anode current collector 110 can be, as a non-limiting example, a sheet or foil of copper, nickel, a copper-nickel alloy, carbon paper, or graphene paper.

In lithium ion batteries, the electrolyte 104 may include a liquid electrolyte, a polymer ionic liquid, a gel electrolyte, or a combination thereof. The electrolyte can be an ionic liquid-based electrolyte mixed with a lithium salt. The ionic liquid may be, for example, at least one selected from N-Propyl-N-methylpyrrolidinium bis(flurosulfonyl)imide, N-methyl-N-propylpyrrolidinium bis(trifluoromethanesulfonyl)imide, N-butyl-N-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide, 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, and 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide. The salt can be or include, for example, a fluorosulfonyl (FS0) group, e.g., lithium bisfluorosulfonylimide (LiN(FS0₂)₂, (LiFSI), LiN(FS0₂)₂, LiN(FS0₂)(CF₃S0₂), LiN(FS0₂)(C₂F₅S0₂). In some embodiments, the electrolyte is or includes a cyclic carbonate (e.g., ethylene carbonate (EC) or propylene carbonate, a cyclic ether such as tetrahydrofuran (THF) or tetrahydropyran (TH), a glyme such as dimethoxyethane (DME) or diethoxyethane, an ether such as diethylether (DEE) or methylbutylether (MBE), their derivatives, and any combinations and mixtures thereof. Where a separator is used, such as with a liquid or gel electrolyte, the separator can be a polyolefine or a polyethylene, as non-limiting examples.

In ASSBs, the electrolyte 104 is solid. The solid electrolyte can be, as non-limiting examples, sulfide compounds (e.g. Argyrodite, LGPS, LPS, etc.), garnet structure oxides (e.g. LLZO with various dopants), NASICON-type phosphate glass ceramics (LAGP), oxynitrides (e.g. lithium phosphorus oxynitride or LIPON), and polymers (PEO).

The cathode current collector 108 can be, as a non-limiting example, an aluminum sheet or foil, carbon paper or graphene paper.

The cathode active material layer 102 has cathode active material coated with one or more of the ion-conducting materials disclosed herein. The cathode active material can include one or more lithium transition metal oxides and lithium transition metal phosphates which can be bonded together using binders and optionally conductive fillers such as carbon black. Lithium transition metal oxides and lithium transition metal phosphates can include, but are not limited to, LiCoO₂, LiNiO₂, LiNi_(0.8)Co_(0.15)Al_(0.05)O₂, LiMnO₂, Li(Ni_(0.5)Mn_(0.5))O₂, LiNi_(x)Co_(y)Mn_(z)O₂, Spinel Li₂Mn₂O₄, LiFePO₄ and other polyanion compounds, and other olivine structures including LiMnPO₄, LiCoPO₄, LiNi_(0.5)Co_(0.5)PO₄, and LiMn_(0.33)Fe_(0.33)Co_(0.33)PO₄.

The cathode active material layer 102 comprises coated active material particles 200 as depicted schematically in FIG. 2. The coated cathode active material particles 200 are particles of cathode active material 202 coated in one or more ion-conducting material 204. The ion-conducting material is selected from the group consisting of: BaLi(B₃O₅)₃; Cs₂LiCl₃; Cs₂LiCrF₆; Cs₂LiDyCl₆; Cs₂LiErCl₆; Cs₂LiGdCl₆; Cs₂LiLuCl₆; Cs₂LiNdCl₆; Cs₂LiPrCl₆; Cs₂LiScCl₆; Cs₂LiSmCl₆; Cs₂LiTbCl₆; Cs₂LiTmCl₆; Cs₂LiYCl₆; Cs₃Li₂Cl₅; Cs₃LiCl₄; CsLi(B₃O₅)₂; CsLi₂Cl₃; CsLi₃Cl₄; CsLiBeF₄; CsLiCl₂; CsLiSO₄; K₁₀LiZr₆H₄O₂F₃₅; K₂LiCeCl₆; K₂LiDyCl₆; K₂LiGdCl₆; K₂LiLaCl₆; K₂LiPrCl₆; K₂LiTbCl₆; KLiDyF₅; KLiErF₅; KLiGdF₅; KLiHoF₅; KLiLuF₅; KLiPH₂O₄F; KLiTbF₅; KLiTmF₅; KLiYF₅; Li₁₀Mg₇Cl₂₄; Li₂B₃O₄F₃; Li₂B₆O₉F₂; Li₂BeCl₄; Li₂BF₅; Li₂CaHfF₈; Li₂H₂SO₅; Li₂MgCl₄; Li₂SiF₆; Li₂SO₄; Li₂Ta₂(OF₂)₃; Li₂ZnCl₄; Li₂ZrF₆; Li₃AlF₆; Li₃ErCl₆; Li₃PO₄; Li₃Sc₂(PO₄)₃; Li₃ScCl₆; Li₃ScF₆; Li₃ThF₇; Li₃YF₆; Li₄Be₃P₃BrO₁₂; Li₄Be₃P₃ClO₁₂; Li₄ZrF₈; Li₆ZrBeF₁₂; Li₉Mg₃P₄O₁₆F₃; LiAlCl₄; LiB₆O₉F; LiBF₄; LiGdCl₄; LiLuF₄; LiScF₄; LiTaF₆; LiThF₅; LiYF₄; LiZr₅T_(l)F₂₂; Na₃Li₃Al₂F₁₂; NaLi₂AlF₆; NaLiBeF₄; NaLiMgPO₄F; Rb₂LiAsO₄; Rb₂LiCeCl₆; Rb₂LiDyCl₆; Rb₂LiErCl₆; Rb₂LiGdCl₆; Rb₂LiLaCl₆; Rb₂LiLuCl₆; Rb₂LiPrCl₆; Rb₂LiScCl₆; Rb₂LiTbCl₆; Rb₂LiYCl₆; RbLi₂Be₂F₇; RbLiCl₂; RbLiF₂; and SrLi(B₃O₅)₃.

The group of ion-conducting material meet the following criteria. Each has an electrochemical stability window against lithium of 2.2 V or wider, with a lowest electrochemical stability being less than 2.0 V and a highest electrochemical stability being greater than 4.2 V. Each is stable with lithium. Each has an estimated lithium ion migration energy of under 1.0 eV.

In another aspect, the ion-conducting material is selected from the group consisting of: Cs₂LiCl₃; Cs₂LiCrF₆; Cs₂LiDyCl₆; Cs₂LiErCl₆; Cs₂LiGdCl₆; Cs₂LiLuCl₆; Cs₂LiNdCl₆; Cs₂LiPrCl₆; Cs₂LiScCl₆; Cs₂LiSmCl₆; Cs₂LiTbCl₆; Cs₂LiTmCl₆; Cs₂LiYCl₆; Cs₃Li₂Cl₅; Cs₃LiCl₄; CsLi₂Cl₃; CsLi₃Cl₄; CsLiBeF₄; CsLiCl₂; K₁₀LiZr₆H₄O₂F₃₅; K₂LiCeCl₆; K₂LiDyCl₆; K₂LiGdCl₆; K₂LiLaCl₆; K₂LiPrCl₆; K₂LiTbCl₆; KLiDyF₅; KLiErF₅; KLiGdF₅; KLiHoF₅; KLiLuF₅; KLiPH₂O₄F; KLiTbF₅; KLiTmF₅; KLiYF₅; Li₁₀Mg₇Cl₂₄; Li₂B₃O₄F₃; Li₂B₆O₉F₂; Li₂BeCl₄; Li₂BF₅; Li₂CaHfF₈; Li₂MgCl₄; Li₂SiF₆; Li₂Ta₂(OF₂)₃; Li₂ZnCl₄; Li₂ZrF₆; Li₃AlF₆; Li₃ErCl₆; Li₃ScCl₆; Li₃ScF₆; Li₃ThF₇; Li₃YF₆; Li₄Be₃P₃BrO₁₂; Li₄Be₃P₃ClO₁₂; Li₄ZrF₈; Li₆ZrBeF₁₂; Li₉Mg₃P₄O₁₆F₃; LiAlCl₄; LiB₆O₉F; LiBF₄; LiGdCl₄; LiLuF₄; LiScF₄; LiTaF₆; LiThF₅; LiYF₄; LiZr₅T_(l)F₂₂; Na₃Li₃Al₂F₁₂; NaLi₂AlF₆; NaLiBeF₄; NaLiMgPO₄F; Rb₂LiCeCl₆; Rb₂LiDyCl₆; Rb₂LiErCl₆; Rb₂LiGdCl₆; Rb₂LiLaCl₆; Rb₂LiLuCl₆; Rb₂LiPrCl₆; Rb₂LiScCl₆; Rb₂LiTbCl₆; Rb₂LiYCl₆; RbLi₂Be₂F₇; RbLiCl₂; and RbLiF₂. Each has an electrochemical stability window against lithium of 2.2 V or wider, with a lowest electrochemical stability being less than 2.0 V and a highest electrochemical stability being greater than 4.2 V. Each is stable with lithium. Each has an estimated lithium ion migration energy of under 1.0 eV. In addition, each material in this group has a halogen component. It is contemplated that the halogen component enables fast ion shuttling and stable electrode/electrolyte interfaces.

The electrochemical stability window of a material is the voltage range in which it is neither oxidized nor reduced. It is measured by subtracting the reduction potential from the oxidation potential. The grand potential phase diagram approach using the density-functional theory (DFT) was used to calculate the electrochemical stability window of materials against lithium. Lithium grand potential phase diagrams represent phase equilibria that are open to lithium, which is relevant when the material is in contact with a reservoir of lithium. The electrochemical stability window of a material is the voltage range in which no lithiation or delithiation occurs, i.e. where lithium uptake is zero. The ion-conducting materials herein each has an electrochemical stability window against lithium of 2.0 V or wider, with a lowest electrochemical stability being less than 2.0 V and a highest electrochemical stability being greater than 4.2 V. The values of the lowest electrochemical stability (2.0 V) and the highest electrochemical stability (4.2 V) are used to represent the operating range of a typical cathode using a transition metal oxide-based cathode active material.

Ionic conductivity is the property most often used to study ionic migration in solids. The ionic conductivity of a solid measures how easily an ion can move from one site to another through defects in the crystal lattice. While ionic conductivity clearly depends on the crystal structure, it is also influenced by the microstructure that emerges from the processing of the solid. To work with a material property that is independent of processing conditions, lithium ion migration energy, i.e., the lithium ion migration barrier, is used as a measure of the ionic migration of lithium compounds.

The 1D barrier measures the lowest energy required by a diffusion species to hop between two opposite faces of a unit cell, in any one of the three directions. The 2D barrier and 3D barrier, correspondingly, measure the lowest energies required to hop between opposite faces in any two or all three directions, respectively. The 1D barrier≤2D barrier≤3D barrier for all solids. The lowest activation energy required to connect every point on the pathway is the 3D migration barrier, and it can provide a quantitative measure of the maximum achievable ionic conductivity. The 1D, 2D, and 3D migration barriers, in general, depend on the dimensionality of the pathway available for lithium conduction in a material. For isotropic materials, where conduction is equally fast in all three dimensions, the three barriers are similar. In such cases, the 3D barrier turns out to be a good estimate of the expected ionic conductivity. In these cases, the 3D barrier is used as an effective barrier. However, many materials have predominant 2D conduction pathways, or in some cases, predominant 1D conduction pathways. In these materials, the 1D/2D barriers can be significantly smaller than the 3D barrier. To account for such cases, the effective barrier is set as either the 1D barrier or the 2D barrier depending on how different they are in magnitude. The ion-conducting materials herein have a low migration barrier, having an estimated migration barrier, or estimated lithium ion migration energy, of 1.0 eV or less.

Table One includes the lowest electrochemical stability and the highest electrochemical stability of the materials disclosed herein, along with the estimated migration barrier of the materials.

Due to the cost and depleting reserves of cobalt, cathode active materials with diminished mole ratios of cobalt, or no cobalt altogether, have been developed. Nickel-rich NMC cathode active materials often have the formula LiNi_(x)M_(1-x)O₂, where x≥0.6 and M=Mn, Co, and sometimes Al. But cycle stability is a weakness due to the many degradation mechanisms available, including irreversible structural transformation, thermal degradation, and formation of a cathode electrolyte interphase (CEI). Dissolution of manganese-ions in acidic environments occurs. The use of nickel alone, such as in LiNiO₂, suffers from severe structural degradation upon lithiation and delithiation. LiNiO₂ is reactive to the electrolyte when charged to high voltages (>4 V vs Li) due to the oxidizing power of the Ni⁴⁺ in the delithiated state.

For at least these reasons, it is contemplated that the cathode active material layer with the ion-conducting material coating performs better than the active material alone. In addition to being excellent lithium ion conductors, it is contemplated that the ion-conducting material impacts the performance of transition metal oxide-based cathode active materials, and in particular those including at least one of nickel, manganese and cobalt, as the ion-conducting materials herein surround the cathode active material, repressing the negative effects that are described above.

When using a transition metal-oxide based cathode active material, and in particular one in which nickel, manganese or cobalt, or a combination of two or more, is used, an ion-conducting material having an electrochemical stability window against lithium of at least 2.8 V, a lowest electrochemical stability being less than 2.0 V and a highest electrochemical stability being greater than 4.8 V, results in further improved lithium battery performance. When the cathode active material layer comprises a transition metal oxide, and in particular a transition metal oxide comprising one or more of nickel, cobalt and manganese, or consisting of one or more of nickel, cobalt and manganese, the ion-conducting material is selected from the group consisting of: BaLi(B₃O₅)₃; Cs₂LiCrF₆; Cs₂LiLuCl₆; CsLiBeF₄; KLiDyF₅; KLiErF₅; KLiGdF₅; KLiHoF₅; KLiLuF₅; KLiTbF₅; KLiTmF₅; KLiYF₅; Li₂BF₅; Li₂CaHfF₈; Li₂SiF₆; Li₂ZrF₆; Li₂Ta₂(OF₂)₃; Li₃AlF₆; Li₃ScF₆; Li₃YF₆; Li₃ThF₇; Li₄ZrF₈; Li₆ZrBeF₁₂; LiB₆O₉F; LiBF₄; LiLuF₄; LiScF₄; LiYF₄; LiThF₅; LiTaF₆; LiZr₅TlF₂₂; Na₃Li₃Al₂F₁₂; NaLi₂AlF₆; NaLiBeF₄; Rb₂LiAsO₄; RbLi₂Be₂F₇; and RbLiF₂. The higher value of the highest electrochemical stability assists to counter the effects on nickel at higher voltages.

In another aspect, when the cathode active material layer comprises a transition metal oxide, and in particular a transition metal oxide comprising one or more of nickel, cobalt and manganese, or consisting of one or more of nickel, cobalt and manganese, the ion-conducting material has a halogen component and is selected from the group consisting of: Cs₂LiCrF₆; Cs₂LiLuCl₆; CsLiBeF₄; KLiDyF₅; KLiErF₅; KLiGdF₅; KLiHoF₅; KLiLuF₅; KLiTbF₅; KLiTmF₅; KLiYF₅; Li₂BF₅; Li₂CaHfF₈; Li₂SiF₆; Li₂ZrF₆; Li₂Ta₂(OF₂)₃; Li₃AlF₆; Li₃ScF₆; Li₃YF₆; Li₃ThF₇; Li₄ZrF₈; Li₆ZrBeF₁₂; LiB₆O₉F; LiBF₄; LiLuF₄; LiScF₄; LiYF₄; LiThF₅; LiTaF₆; LiZr₅TlF₂₂; Na₃Li₃Al₂F₁₂; NaLi₂AlF₆; NaLiBeF₄; RbLi₂Be₂F₇; and RbLiF₂.

TABLE 1 Lowest Highest Estimated Electrochemical Electrochemical Material Barrier Stability Stability BaLi(B₃O₅)₃ 0.268 1.269 4.813 Cs₂LiCl₃ 0.105 0.000 4.265 Cs₂LiCrF₆ 0.360 1.882 4.822 Cs₂LiDyCl₆ 0.849 0.510 4.289 Cs₂LiErCl₆ 0.890 0.413 4.585 Cs₂LiGdCl₆ 0.802 0.439 4.577 Cs₂LiLuCl₆ 0.903 0.418 4.803 Cs₂LiNdCl₆ 0.938 0.592 4.273 Cs₂LiPrCl₆ 0.829 0.452 4.255 Cs₂LiScCl₆ 0.379 0.617 4.365 Cs₂LiSmCl₆ 0.958 0.451 4.487 Cs₂LiTbCl₆ 0.748 0.414 4.579 Cs₂LiTmCl₆ 0.971 0.408 4.272 Cs₂LiYCl₆ 0.892 0.420 4.587 Cs₃Li₂Cl₅ 0.189 0.000 4.265 Cs₃LiCl₄ 0.148 0.000 4.265 CsLi(B₃O₅)₂ 0.649 1.092 4.690 CsLi₂Cl₃ 0.254 0.000 4.265 CsLi₃Cl₄ 0.455 0.000 4.255 CsLiBeF₄ 0.705 0.741 6.482 CsLiCl₂ 0.230 0.000 4.265 CsLiSO₄ 0.923 1.543 4.789 K₁₀LiZr₆H₄O₂F₃₅ 0.818 1.957 4.657 K₂LiCeCl₆ 0.424 0.582 4.255 K₂LiDyCl₆ 0.991 0.552 4.255 K₂LiGdCl₆ 0.461 0.510 4.255 K₂LiLaCl₆ 0.390 0.356 4.255 K₂LiPrCl₆ 0.401 0.486 4.255 K₂LiTbCl₆ 0.489 0.494 4.255 KLiDyF₅ 0.433 0.287 6.150 KLiErF₅ 0.357 0.279 6.131 KLiGdF₅ 0.363 0.388 6.155 KLiHoF₅ 0.356 0.282 6.151 KLiLuF₅ 0.361 0.274 6.139 KLiPH₂O₄F 0.661 1.942 4.458 KLiTbF₅ 0.365 0.291 6.156 KLiTmF₅ 0.337 0.259 6.183 KLiYF₅ 0.368 0.325 6.114 Li₁₀Mg₇Cl₂₄ 0.379 0.882 4.255 Li₂B₃O₄F₃ 0.120 1.877 4.461 Li₂B₆O₉F₂ 0.627 1.860 4.329 Li₂BeCl₄ 0.722 1.521 4.255 Li₂BF₅ 0.528 1.938 6.362 Li₂CaHfF₈ 0.450 1.013 6.683 Li₂H₂SO₅ 0.885 1.932 4.415 Li₂MgCl₄ 0.341 0.882 4.255 Li₂SiF₆ 0.464 1.835 6.678 Li2SO4 0.251 1.574 4.667 Li₂Ta₂(OF₂)₃ 0.333 1.700 4.882 Li₂ZnCl₄ 0.456 1.948 4.255 Li₂ZrF₆ 0.507 1.240 6.557 Li₃A1F₆ 0.175 1.058 6.478 Li₃ErCl₆ 0.664 0.714 4.257 Li₃PO₄ 0.376 0.689 4.210 Li₃Sc₂(PO₄)₃ 0.547 1.862 4.206 Li₃ScCl₆ 0.037 0.907 4.255 Li₃ScF₆ 0.161 0.603 6.361 Li₃ThF₇ 0.338 0.697 6.361 Li₃YF₆ 0.215 0.364 6.361 Li₄Be₃P₃BrO₁₂ 0.418 1.707 4.405 Li₄Be₃P₃ClO₁₂ 0.347 1.717 4.473 Li₄ZrF₈ 0.427 1.209 6.377 Li₆ZrBeF₁₂ 0.440 1.209 6.377 Li₉Mg₃P₄O₁₆F₃ 0.215 1.544 4.210 LiAlCl₄ 0.390 1.590 4.453 LiB₆O₉F 0.293 1.933 4.805 LiBF₄ 0.123 1.938 7.108 LiGdCl₄ 0.529 0.746 4.255 LiLuF₄ 0.692 0.289 6.687 LiScF₄ 0.771 0.603 6.362 LiTaF₆ 0.719 1.874 7.224 LiThF₅ 0.073 0.697 6.408 LiYF₄ 0.594 0.364 6.558 LiZr₅T₁F₂₂ 0.823 1.947 4.868 Na₃Li₃Al₂F₁₂ 0.198 0.939 6.567 NaLi₂AlF₆ 0.059 1.058 6.478 NaLiBeF₄ 0.402 0.886 6.480 NaLiMgPO₄F 0.417 1.507 4.229 Rb₂LiAsO₄ 0.345 1.259 6.571 Rb₂LiCeCl₆ 0.976 0.552 4.255 Rb₂LiDyCl₆ 0.934 0.571 4.255 Rb₂LiErCl₆ 0.976 0.468 4.316 Rb₂LiGdCl₆ 0.885 0.484 4.255 Rb₂LiLaCl₆ 0.910 0.320 4.255 Rb₂LiLuCl₆ 0.991 0.469 4.748 Rb₂LiPrCl₆ 0.904 0.453 4.255 Rb₂LiScCl₆ 0.993 0.686 4.628 Rb₂LiTbCl₆ 0.826 0.562 4.255 Rb₂LiYCl₆ 0.978 0.590 4.255 RbLi₂Be₂F₇ 0.433 0.841 6.106 RbLiCl₂ 0.703 0.000 4.255 RbLiF₂ 0.351 0.620 5.604 SrLi(B₃O₅)₃ 0.321 1.559 4.531

Unless otherwise defined, all technical and scientific terms used have the same meaning as commonly understood by one of ordinary skill in the art to which the claimed subject matter belongs. The terminology used in this description is for describing particular embodiments only and is not intended to be limiting. As used in the specification and appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise.

While the disclosure has been described in connection with certain embodiments, it is to be understood that the disclosure is not to be limited to the disclosed embodiments but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the scope of the appended claims, which scope is to be accorded the broadest interpretation so as to encompass all such modifications and equivalent structures as is permitted under the law. 

What is claimed is:
 1. A lithium battery, comprising: an anode comprising lithium; an electrolyte; and a cathode comprising cathode active material, the cathode active material comprising particles of a transition metal oxide, each particle coated in an ion-conducting material that has an electrochemical stability window against lithium of at least 2.2 V, a lowest electrochemical stability being less than 2.0 V and a highest electrochemical stability being greater than 4.2 V, the ion-conducting material selected from the group consisting of: Cs₂LiCl₃; Cs₂LiCrF₆; Cs₂LiDyCl₆; Cs₂LiErCl₆; Cs₂LiGdCl₆; Cs₂LiLuCl₆; Cs₂LiNdCl₆; Cs₂LiPrCl₆; Cs₂LiScCl₆; Cs₂LiSmCl₆; Cs₂LiTbCl₆; Cs₂LiTmCl₆; Cs₂LiYCl₆; Cs₃Li₂Cl₅; Cs₃LiCl₄; CsLi₂Cl₃; CsLi₃Cl₄; CsLiBeF₄; CsLiCl₂; K₁₀LiZr₆H₄O₂F₃₅; K₂LiCeCl₆; K₂LiDyCl₆; K₂LiGdCl₆; K₂LiLaCl₆; K₂LiPrCl₆; K₂LiTbCl₆; KLiDyF₅; KLiErF₅; KLiGdF₅; KLiHoF₅; KLiLuF₅; KLiPH₂O₄F; KLiTbF₅; KLiTmF₅; KLiYF₅; Li₁₀Mg₇Cl₂₄; Li₂B₃O₄F₃; Li₂B₆O₉F₂; Li₂BeCl₄; Li₂BF₅; Li₂CaHfF₈; Li₂MgCl₄; Li₂SiF₆; Li₂Ta₂(OF₂)₃; Li₂ZnCl₄; Li₂ZrF₆; Li₃AlF₆; Li₃ErCl₆; Li₃ScCl₆; Li₃ScF₆; Li₃ThF₇; Li₃YF₆; Li₄Be₃P₃BrO₁₂; Li₄Be₃P₃ClO₁₂; Li₄ZrF₈; Li₆ZrBeF₁₂; Li₉Mg₃P₄O₁₆F₃; LiAlCl₄; LiB₆O₉F; LiBF₄; LiGdCl₄; LiLuF₄; LiScF₄; LiTaF₆; LiThF₅; LiYF₄; LiZr₅T_(l)F₂₂; Na₃Li₃Al₂F₁₂; NaLi₂AlF₆; NaLiBeF₄; NaLiMgPO₄F; Rb₂LiCeCl₆; Rb₂LiDyCl₆; Rb₂LiErCl₆; Rb₂LiGdCl₆; Rb₂LiLaCl₆; Rb₂LiLuCl₆; Rb₂LiPrCl₆; Rb₂LiScCl₆; Rb₂LiTbCl₆; Rb₂LiYCl₆; RbLi₂Be₂F₇; RbLiCl₂; and RbLiF₂.
 2. The lithium battery of claim 1, wherein the lithium battery is an all-solid-state battery and the electrolyte is a solid electrolyte.
 3. The lithium battery of claim 1, wherein the transition metal oxide comprises one or more of nickel, cobalt and manganese.
 4. The lithium battery of claim 1, wherein the electrochemical stability window against lithium of the ion-conducting material is at least 2.8 V and the highest electrochemical stability is greater than 4.8 V, the ion-conducting material selected from the group consisting of: Cs₂LiCrF₆; Cs₂LiLuCl₆; CsLiBeF₄; KLiDyF₅; KLiErF₅; KLiGdF₅; KLiHoF₅; KLiLuF₅; KLiTmF₅; KLiTmF₅; KLiYF₅; Li₂BF₅; Li₂CaHfF₈; Li₂SiF₆; Li₂ZrF₆; Li₂Ta₂(OF₂)₃; Li₃AlF₆; Li₃ScF₆; Li₃YF₆; Li₃ThF₇; Li₄ZrF₈; Li₆ZrBeF₁₂; LiB₆O₉F; LiBF₄; LiLuF₄; LiScF₄; LiYF₄; LiThF₅; LiTaF₆; LiZr₅TlF₂₂; Na₃Li₃Al₂F₁₂; NaLi₂AlF₆; NaLiBeF₄; RbLi₂Be2F₇; and RbLiF₂.
 5. The lithium battery of claim 4, wherein the lithium battery is an all-solid-state battery and the electrolyte is a solid electrolyte.
 6. The lithium battery of claim 4, wherein the transition metal oxide comprises one or more of nickel, cobalt and manganese.
 7. An all-solid-state battery, comprising: a lithium-metal based anode; a solid electrolyte; and a cathode comprising a transition metal oxide active material coated in an ion-conducting material that has an electrochemical stability window against lithium of at least 2.2 V, a lowest electrochemical stability being less than 2.0 V and a highest electrochemical stability being greater than 4.2 V, the ion-conducting material selected from the group consisting of: Cs₂LiCl₃; Cs₂LiCrF₆; Cs₂LiDyCl₆; Cs₂LiErCl₆; Cs₂LiGdCl₆; Cs₂LiLuCl₆; Cs₂LiNdCl₆; Cs₂LiPrCl₆; Cs₂LiScCl₆; Cs₂LiSmCl₆; Cs₂LiTbCl₆; Cs₂LiTmCl₆; Cs₂LiYCl₆; Cs₃Li₂Cl₅; Cs₃LiCl₄; CsLi₂Cl₃; CsLi₃Cl₄; CsLiBeF₄; CsLiCl₂; K₁₀LiZr₆H₄O₂F₃₅; K₂LiCeCl₆; K₂LiDyCl₆; K₂LiGdCl₆; K₂LiLaCl₆; K₂LiPrCl₆; K₂LiTbCl₆; KLiDyF₅; KLiErF₅; KLiGdF₅; KLiHoF₅; KLiLuF₅; KLiPH₂O₄F; KLiTbF₅; KLiTmF₅; KLiYF₅; Li₁₀Mg₇Cl₂₄; Li₂B₃O₄F₃; Li₂B₆O₉F₂; Li₂BeCl₄; Li₂BF₅; Li₂CaHfF₈; Li₂MgCl₄; Li₂SiF₆; Li₂Ta₂(OF₂)₃; Li₂ZnCl₄; Li₂ZrF₆; Li₃AlF₆; Li₃ErCl₆; Li₃ScCl₆; Li₃ScF₆; Li₃ThF₇; Li₃YF₆; Li₄Be₃P₃BrO₁₂; Li₄Be₃P₃ClO₁₂; Li₄ZrF₈; Li₆ZrBeF₁₂; Li₉Mg₃P₄O₁₆F₃; LiAlCl₄; LiB₆O₉F; LiBF₄; LiGdCl₄; LiLuF₄; LiScF₄; LiTaF₆; LiThF₅; LiYF₄; LiZr₅T_(l)F₂₂; Na₃Li₃Al₂F₁₂; NaLi₂AlF₆; NaLiBeF₄; NaLiMgPO₄F; Rb₂LiCeCl₆; Rb₂LiDyCl₆; Rb₂LiErCl₆; Rb₂LiGdCl₆; Rb₂LiLaCl₆; Rb₂LiLuCl₆; Rb₂LiPrCl₆; Rb₂LiScCl₆; Rb₂LiTbCl₆; Rb₂LiYCl₆; RbLi₂Be₂F₇; RbLiCl₂; and RbLiF₂.
 8. The all-solid-state battery of claim 7, wherein the transition metal oxide active material comprises one or more of nickel, cobalt and manganese.
 9. The all-solid-state battery of claim 7, wherein the electrochemical stability window of the ion-conducting material is at least 2.8 V and the highest electrochemical stability is greater than 4.8 V, the ion-conducting material selected from the group consisting of: Cs₂LiCrF₆; Cs₂LiLuCl₆; CsLiBeF₄; KLiDyF₅; KLiErF₅; KLiGdF₅; KLiHoF₅; KLiLuF₅; KLiTbF₅; KLiTmF₅; KLiYF₅; Li₂BF₅; Li₂CaHfF₈; Li₂SiF₆; Li₂ZrF₆; Li₂Ta₂(OF₂)₃; Li₃AlF₆; Li₃ScF₆; Li₃YF₆; Li₃ThF₇; Li₄ZrF₈; Li₆ZrBeF₁₂; LiB₆O₉F; LiBF₄; LiLuF₄; LiScF₄; LiYF₄; LiThF₅; LiTaF₆; LiZr₅TlF₂₂; Na₃Li₃Al₂F₁₂; NaLi₂AlF₆; NaLiBeF₄; RbLi₂Be₂F₇; and RbLiF₂.
 10. The all-solid-state battery of claim 9, wherein the transition metal oxide active material comprises one or more of nickel, cobalt and manganese.
 11. A cathode for a lithium battery, comprising: active cathode material particles; and a coating on the active cathode material particles, wherein the coating comprises an ion-conducting material, the ion-conducting material having an electrochemical stability window against lithium of at least 2.2 V, a lowest electrochemical stability being less than 2.0 V and a highest electrochemical stability being greater than 4.2 V, the ion-conducting material comprising one or more of : Cs₂LiCl₃; Cs₂LiCrF₆; Cs₂LiDyCl₆; Cs₂LiErCl₆; Cs₂LiGdCl₆; Cs₂LiLuCl₆; Cs₂LiNdCl₆; Cs₂LiPrCl₆; Cs₂LiScCl₆; Cs₂LiSmCl₆; Cs₂LiTbCl₆; Cs₂LiTmCl₆; Cs₂LiYCl₆; Cs₃Li₂Cl₅; Cs₃LiCl₄; CsLi₂Cl₃; CsLi₃Cl₄; CsLiBeF₄; CsLiCl₂; K₁₀LiZr₆H₄O₂F₃₅; K₂LiCeCl₆; K₂LiDyCl₆; K₂LiGdCl₆; K₂LiLaCl₆; K₂LiPrCl₆; K₂LiTbCl₆; KLiDyF₅; KLiErF₅; KLiGdF₅; KLiHoF₅; KLiLuF₅; KLiPH₂O₄F; KLiTbF₅; KLiTmF₅; KLiYF₅; Li₁₀Mg₇Cl₂₄; Li₂B₃O₄F₃; Li₂B₆O₉F₂; Li₂BeCl₄; Li₂BF₅; Li₂CaHfF₈; Li₂MgCl₄; Li₂SiF₆; Li₂Ta₂(OF₂)₃; Li₂ZnCl₄; Li₂ZrF₆; Li₃AlF₆; Li₃ErCl₆; Li₃ScCl₆; Li₃ScF₆; Li₃ThF₇; Li₃YF₆; Li₄Be₃P₃BrO₁₂; Li₄Be₃P₃ClO₁₂; Li₄ZrF₈; Li₆ZrBeF₁₂; Li₉Mg₃P₄O₁₆F₃; LiAlCl₄; LiB₆O₉F; LiBF₄; LiGdCl₄; LiLuF₄; LiScF₄; LiTaF₆; LiThF₅; LiYF₄; LiZr₅T_(l)F₂₂; Na₃Li₃Al₂F₁₂; NaLi₂AlF₆; NaLiBeF₄; NaLiMgPO₄F; Rb₂LiCeCl₆; Rb₂LiDyCl₆; Rb₂LiErCl₆; Rb₂LiGdCl₆; Rb₂LiLaCl₆; Rb₂LiLuCl₆; Rb₂LiPrCl₆; Rb₂LiScCl₆, Rb₂LiTbCl₆; Rb₂LiYCl₆; RbLi₂Be₂F₇; RbLiCl₂; and RbLiF₂.
 12. The cathode for the lithium battery of claim 11, wherein the active cathode material particles comprise a transition metal oxide.
 13. The cathode for the lithium battery of claim 12, wherein the transition metal oxide comprises one or more of nickel, cobalt and manganese.
 14. The cathode for the lithium battery of claim 11, wherein the electrochemical stability window against lithium of the ion-conducting material is at least 2.8 V and the highest electrochemical stability is greater than 4.8 V, the ion-conducting material comprising one or more of Cs₂LiCrF₆; Cs₂LiLuCl₆; CsLiBeF₄; KLiDyF₅; KLiErF₅; KLiGdF₅; KLiHoF₅; KLiLuF₅; KLiTbF₅; KLiTmF₅; KLiYF₅; Li₂BF₅; Li₂CaHfF₈; Li₂SiF₆; Li₂ZrF₆; Li₂Ta₂(OF₂)₃; Li₃AlF₆; Li₃ScF₆; Li₃YF₆; Li₃ThF₇; Li₄ZrF₈; Li₆ZrBeF₁₂; LiB₆O₉F; LiBF₄; LiLuF₄; LiScF₄; LiYF₄; LiThF₅; LiTaF₆; LiZr₅TlF₂₂; Na₃Li₃Al₂F₁₂; NaLi₂AlF₆; NaLiBeF₄; RbLi₂Be₂F₇; and RbLiF₂.
 15. The cathode for the lithium battery of claim 14, wherein the active cathode material particles comprise a transition metal oxide.
 16. The cathode for the lithium battery of claim 15, wherein the transition metal oxide comprises one or more of nickel, cobalt and manganese. 